Missing zlib extensions PHP Error

Hi, on my website (hosted on my VPS), I sometimes get this annoying PHP error:
“Abort class-pclzip.php : Missing zlib extensions”

I have had it for a few months now and the issue is still here. I have the latest version of WordPress, my plugins, my themes, Ubuntu, PHP, and my other packages. Sometimes I get the error when I first go to the website, other times it pops up while I’m in the admin panel. The most annoying part is that it’s totally random and can occur anytime, anywhere (or so it seems). The second most annoying part is that the issue hasn’t fixed itself over time or through updates. I have ran the site for a while without this issue, but it started coming about a few months ago (I’m not sure how). My active plugins are Akismet, iThemes Security, Jetpack, and WordPress SEO. I could try to deactivate each plugin one by one to try and see if the error comes from there, but the error is pretty rare and it would be almost impossible to say for sure if it’s a specific plugin that way as the error might not pop up during testing. Other than this issue, the site appears to be working fine. Any help would be greatly appreciated. Thank you.